Module substrate antenna, and module substrate mounting the same

Abstract

A module substrate antenna includes: a laminate in which a plurality of ferrite layers are stacked; antennal coils provided on surfaces of the respective ferrite layers; a connection pad connected to an external circuit; and a lead wire provided between the laminate and the connection pad. In the laminate, the antenna coils are two types of the antenna coils, and the two types of the antenna coils are alternately stacked.

What is claimed is: 
     
       1. A module substrate antenna, comprising:
 a laminate in which a plurality of ferrite layers are stacked; 
 antennal coils provided on surfaces of the respective ferrite layers; 
 a connection pad connected to an external circuit; and 
 a lead wire provided between the laminate and the connection pad, 
 wherein, in the laminate, the antenna coils are two types of the antenna coils, the two types of the antenna coils are alternately stacked, and the two types of the antenna coils have different antenna patterns. 
 
     
     
       2. The module substrate antenna of  claim 1 , wherein:
 the connection pad is connected to an electrode for mounting ICs provided in an IC mounted surface of the uppermost layer of the ferrite layers in the laminate through the lead wire, and 
 the connection pad is exposed in a position opposite to the IC mounted surface. 
 
     
     
       3. The module substrate antenna of  claim 2 , wherein the lead wire is connected to the electrode for mounting ICs through internal portions of the antenna coils of the ferrite layers. 
     
     
       4. The module substrate antenna of  claim 1 , wherein a capacitor comprised of a pair of electrodes for capacitors is provided between the lead wire and the connection pad. 
     
     
       5. The module substrate antenna of  claim 4 , wherein:
 the capacitor is connected in parallel to the antenna coils, and 
 the capacitor and the antenna coils form an LC resonance circuit. 
 
     
     
       6. A module substrate comprising the module substrate antenna of  claim 1 .